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Testicular Cancer - Cancer that begins in one or both testicles. Also known as testes, the testicles are the egg-shaped glands located inside the scrotum (at the base of the penis) which produce sperm and male sex hormones (testosterone). Testicular cancer usually affects only one testicle. The most common type of testicular tumors are germ cell tumors, which grow in the cells that make sperm. Testicular cancer commonly occurs in young men between the ages of 15 and 35, and is most often discovered through routine self examination. Having had an undescended testicle, Klinefelter syndrome, and health history are potential risk factors for developing testicular cancer.
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